Which two options are valid WAN connectivity methods? (Choose two.)

A.
PPP

B.
WAP

C.
DSL

D.
L2TPv3

E.
Ethernet

Explanation:
On each WAN connection, data is encapsulated into frames before itcrosses the
WAN link. The following are typical WAN protocols:1. High-level Data Link Control (HDLC): The
Cisco default encapsulation type onpoint-to-point connections, dedicated links, and circuitswitches connections.2. PPP: Provides router-to-router and host-to-network connections over
synchronous andasynchronous circuits. PPP was designed to work with several network layer
protocols,including IP.3. Frame-relay: A successor to X.25. This protocol is an industry-standard,
switchesdata-link layer protocol that handles multiple virtual circuits
http://en.wikipedia.org/wiki/Wide_area_network